Proposed Combined PTS with Clipping and Filtering Technique for PAPR Reduction in OFDM System


One of the major drawbacks of OFDM is high Peak-to-Average Power Ratio(PAPR) which can result in poor power efficiency and serious distortion in the transmitter amplifier. In this paper, the advantages of two different approaches to PAPR reduction are exploited in order to reduce the PAPR more significantly. The first approach is based on clipping and filtering which provides a high PAPR reduction at the cost of signal distortion. The second approach (Partial Transmit Sequence PTS or Selected Mapping SLM methods) results in no distortion. Theperformance of the three proposed combined methods(Clipping And Filtering with PTS scheme, SLM with Clipping And Filtering scheme, and PTS with Clipping And Filtering scheme)are evaluated on the PAPR distribution function and on the Bit Error Rate as a function of Signal to Noise Ratio in Additive White Gaussian Noise Channel. The simulation results show that the proposed PTS with Clipping And Filtering scheme provides more PAPR reduction without degradation in the BER performance as compared to the other two proposed scheme (Clipping And Filteringwith PTS scheme and SLM with Clipping And Filtering scheme). The simulation results of PAPR reduction and BER performances are simulated using MATLAB R2009a computer simulation software.